Keep in mind, it is a property of the wave medium, so we have to do something to the string to alter the wave speed. From earlier discussions, we know that tightening the string increases the wave speed.
Infants. Most infants receive the majority of their protein from breast milk or infant formula. The Institute of Medicine recommends babies ages 0 to 6 months consume at least 9.1 grams of protein, and infants ages 7 to 12 months eat at least 11 grams of protein every day.
You can figure out how much protein you need if you know how much you weigh. Each day, kids need to eat about 0.5 grams of protein for every pound (0.5 kilograms) they weigh. That's a gram for every 2 pounds (1 kilogram) you weigh. Your protein needs will grow as you get bigger, but then they will level off when you reach adult size. Adults, for instance, need about 60 grams per day.